机床的走刀机构,大多采用标准齿轮齿条传动(图1)。优点是工作可靠,易于制造。缺点是标准齿条周节t=πm,为非整数,走刀齿轮转一周,其进给量为非整数b=πmz,所以实际进给量与走刀刻度盘示值有一定的设计误差,影响进给精度。而采用周节变位齿条(下简称:周变齿条)与标准齿轮啮合传动,可以克服走刀设计误差。 Machine tool walk agencies, most of the standard rack and pinion (Figure 1). The advantage is reliable, easy to manufacture. The disadvantage is that the standard rack weeks t = πm, non-integer, take a knife gear for a week, the feed is non-integer b = πmz, so the actual feed and take the knife dial shows a certain design error, Affect the feed accuracy. The use of perimeter variable rack (hereinafter referred to: weeks change rack) and standard gear meshing drive, you can overcome the design error of the knife.